EP2615270A1 - Device for removing and reclaiming crank chamber gases from a combustion engine - Google Patents

Abstract

The device (2) has a flange (5) for mounting through the housing wall. A suction channel (16) and a return channel (18) are guided through the engine wall by the flange and are attached to a measuring device for detection of gases and aerosol concentrations, particularly from lubricating oil mist. The suction channel and the return channel on the engine side and away from the flange are designed as a double channel made of flexible elastomer and separated against each other by a partition wall (26). Channel openings (17,20) are diagonally formed at the ends of the double channel.

Description

Technical area

The invention relates to a device for removing and returning propellant gas from an internal combustion engine, according to the preamble of claim 1.

State of the art

The monitoring of gases and aerosol concentrations, in particular of lubricating oil mist in the working spaces of working machines, in particular of internal combustion engines, of high-pressure fuel units for supplying the internal combustion engines or power transmissions, is to avoid damage of considerable importance. A rapid increase in the oil mist concentration can namely close to damage, such as the cracking of a lubricating film. As a result of the resulting frictional heat form oil vapors, which condense in the working space to oil mist and thus lead to a rapid increase in oil mist concentration. If the resulting risk is quickly recognized, appropriate countermeasures, such as A shutdown of the machine or of individual machine components can avoid explosions and thus risks to persons and further damage to the machine. But it is also possible to examine other sensors by gas certain proportions in such a working atmosphere.

Furthermore, in addition to the tearing off of the lubricating film in bearings in piston engines between the piston and its cylinder wall due to defective piston rings - so-called blower - occur, leading to a total damage of the piston / cylinder unit ("piston eater"). An increase in the oil mist density with a simultaneous increase in temperature as a result of the hot combustion gases suggest such a blower.

First approaches to measuring the oil mist concentration are from the EP-A-0 071 391 known. In the EP-A-0 071 391 It is proposed to suck the aerosol from the working space through a measuring chamber with the aid of a blower and to carry out a reflection measurement with the aid of a radiation source and a radiation sensor. The impeller blower proposed therein is to be used for a plurality of chambers arranged in parallel.

In order to get the aerosol out of the working chamber of the internal combustion engine, must - as well as from the WO 2007/140640 A1 known - a suction line are introduced into the working space. In the WO 2007/140640 A1 It is proposed to return the aspirated aerosol back to the working space after it has been examined - elsewhere.

In the EP 2 386 733 A1 it is proposed for a suction line and a return to make this at about the same location, so that the intake and the return of the gas / aerosol mixture fall close together, which has proved to be advantageous.

In the EP 2 386 733 A1 is provided that the lines are passed by a flange through the wall of the working space and from the flange initially a substantially horizontal area and then - after a manifold - are guided approximately vertically. This has proven to be advantageous in principle.

However, the process of flanging the measuring device or the jointly guided suction and return pipe according to the EP 2 386 733 A1 associated with certain difficulties, in particular, if this process is to be carried out at a closed engine block.

Presentation of the invention

The object of the invention is to propose an improved device for the removal and return of Treibraumgas from an internal combustion engine, in which the disadvantages of the known in the prior art common intake and return line can be avoided without having to forego the advantages described above , This object of the invention is achieved by a device according to claim 1. The measures of the invention initially have the consequence that a simple external assembly of the device is possible, even with strong engine walls. Due to the slanted channel openings - namely the intake and the return opening - a very good splash guard is given. The assembly is also in the engine compartment lying in the engine compartment interference edges, such. a bulkhead, because of the flexible Elastomerkrümmers possible. Particularly advantageous is a spatially separated intake and return opening through the opening offset.

The measuring device and thus also the device according to the present invention is intended in particular for marine engines and also for engines in power plants, ie large diesel engines, but also for smaller engines. The case of possible oil accumulation by the engine inclinations, which can probably never be completely avoided in a marine diesel, are optimally prevented by a kidney structure, so one separated by a partition, preferably in approximately round or oval round double channel. This also closures of the flow channel can be avoided. Basically, the application of the inventive device is not limited to the removal for the purpose of oil mist detection, but can also be provided for other applications in which access to the work space is required.

An integrated seal for the sensor support bracket is advantageous.

The manufacture of the device according to the invention is very simple and therefore cost-effective through the elastomer partition wall in the engine wall fitting.

The above-mentioned as well as the claimed and described in the following embodiments, according to the invention to be used elements are subject to their size, shape design, material usage and their technical conception no special conditions of exception, so that the well-known in the respective field of application selection criteria can apply without restriction.

Brief description of the drawings

Figur 1

eine 3-D Darstellung eines Ausführungsbeispiels der erfindungsgemässen Einrichtung, in seitlicher Ansicht;

Figur 2

eine 3-D Darstellung gemäss Figur 1, in frontaler Ansicht; und

Figur 3

eine 3-D Darstellung gemäss Figur 1, bei der der Rückführungskanal längs aufgeschnitten dargestellt ist und die Darstellung ebenfalls die angeflanschte Sensortragkonsole enthält.

Further details, advantages and features of the subject matter of the present invention will become apparent from the following description of the accompanying drawings, in which - by way of example - inventive measuring devices are explained. In the drawings shows:

FIG. 1

a 3-D representation of an embodiment of the inventive device, in a side view;

FIG. 2

a 3-D representation according to FIG. 1 in frontal view; and

FIG. 3

a 3-D representation according to FIG. 1 , wherein the return channel is shown cut longitudinally and the representation also includes the flanged sensor support bracket.

Ways to carry out the invention

In the in FIG. 1 screw-engageable engagement, namely a suction and recirculation device 2 according to a preferred embodiment of the present invention performs an intake passage and a return passage through the screwed by means of a motor wall 8 and lockable with a lock nut 14 flange 5 therethrough. The suction channel 16 is provided so that by means of a suction device (in the present embodiment, a Venturieinrichtung 10) engine compartment atmosphere can be sucked out of the housing or engine compartment, while the return passage 18 is provided so that this engine compartment atmosphere is returned to the engine compartment. In this respect, these channels end from the point of view of the present intervention on a sensor support bracket 12.

The intake duct 16 and the return duct 18 are on the motor side from the Flansch5 as a flexible elastomer, against each other by means of an elastomer partition wall 26 round - so if you consider both känale together formed in approximately kidney-shaped double channel 24. At the ends of obliquely formed, mutually offset by a few cm arranged channel openings 17, 20 are formed.

Between the double channel and the return channel in the region of the flange and the channel openings 17, 20, an elastomer manifold 22 with a bending angle of about 125 ° is arranged. The engine wall fitting 8 and the lock nut 14 have seals 6 which seal engagement with the sensor support bracket and against the engine compartment wall. The integrated seal 28 seals the flange 5 from the sensor support bracket 12.

By the arrangement described above, it is easily possible to screw the engagement in the engine compartment or housing wall. Due to the formation of Elastomerkummers 22 while lying in the engine compartment interference edges, such as a bulkhead, etc., no consideration must be taken, since the manifold 4 passes flexible past these - screwed - can be. For very strong engine compartment walls, the Elastomerkümmer 4 can possibly be folded for insertion and will then unfold again later. insofar a simple external assembly of the procedure is possible, even with strong engine walls.

LIST OF REFERENCE NUMBERS

2

Extraction and return device

4

intake manifold

5

flange

6

poetry

8th

Motorwandverschraubung

12

Sensor support bracket

14

locknut

16

intake port

17

suction

18

Return passage

20

Return opening

22

Elastomerkrümmer

24

kidney structure

26

elastomer partition

28

Integrated seal

Claims (6)

Device for drawing off and returning motive gas from work spaces of internal combustion engines or housings of power transmissions, having a flange (5) for mounting through the housing wall, an intake passage (16) and a return passage (18), the intake passage (16) and a return passage (16) 18) are guided through the motor wall by means of the flange (5) and can be connected to a measuring device for the detection of gases and aerosol concentrations, in particular of lubricating oil mist,
characterized in that
the suction channel (16) and the return channel (18) are formed at least on the motor side from the flange (5) as a double channel consisting of a flexible elastomer, separated from each other by a partition (26), preferably a round double channel, at the end of which channel openings (17 , 20) are arranged. Device for the removal and return of motive gas according to claim 1, characterized in that the channel openings (17, 20) are formed obliquely. Device for the removal and return of motive gas according to claim 1 or 2, characterized in that the channel openings (17, 20) are arranged offset. Device for drawing off and returning motive gas according to one of claims 1 to 3, characterized in that between the intake passage (16) and the return passage (18) in the region of the flange (5) and the channel openings (17, 20) an elastomer manifold (22 ) is provided with a bending angle of about 70 ° to 150 °, preferably of about 125 °. Device for drawing off and returning traction chamber gas according to one of claims 1 to 4, characterized in that the flange (5) has a motor wall fitting (8) with seals (6) which seal the device against the measuring device and against the engine compartment wall. Device for drawing off and returning traction chamber gas according to one of Claims 1 to 4, characterized by a lock nut (14) which can be screwed sealingly onto the motor wall screw connection (8) of the flange (5).

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